Autosequence preceding -A226158(n).

Terms

a(0) =0a(1) =0a(2) =0a(3) =1a(4) =2a(5) =2a(6) =1a(7) =1a(8) =4a(9) =4a(10) =-13a(11) =-13a(12) =142a(13) =142a(14) =-1931a(15) =-1931a(16) =36296a(17) =36296a(18) =-893273a(19) =-893273a(20) =27927346a(21) =27927346a(22) =-1081725559a(23) =-1081725559a(24) =50861556172a(25) =50861556172